Stoker



May 1, 1923.

G. H. THACHER, JR

STOKER Filed Dec. 28 1920 Patented May 1, 1923.

UNITE enonen nonnnL TEACHER, JR, or noarrr rnovinnnon, anonn ISLAND.

STOKEB- Applicationv fi led Decem b er 28,1829. Serial No. 433,595.

PatentNo, 1,302,?153, granted on April 29,

19 19, and the present application is a'contin'ua't i'on'i n part of my prior application, Serial No. 353,423, filed January 23, 1920.

' The object of the invention is to provide an improved form of stoker bar, especially adapted for use with the stoker forming the subject-matter of'the above mentioned patent, wherein the'bar is so constructed that i tmay'be'easily repaired by the removal of damaged elements and their replacement by 11'ew,'and wherein mechanism is provided 4 in connection with the bar and detachable elements for firmly locking the said elements infplacein the bar.

In the drawings- Figure l is a vertical section through the improved bar,

Figure 2 is an elevation of a part of the shield and one side member of the bar,

Figure 3 is a view similar to Figure 1,

but with the various detachable elements of the bar removed, i

Figure 4 is a plan view of a part of the shield and one of the side members,

Figure 5 is a transverse sectional view of the removable supporting bar,

' Figure 6 is'a side view of a portion of the same, y

Figure 7 is a side view of one of the removable grate sections,

Figure8 is a top 'plan ,view of one of the sections,

Figure 9 is a section along the line 9-9 of- Figure 8, i t

Figure 10" is an end view of the grate seeso tion of Figure 9 looking from the right,

Figure 11 is an endview of the grate section Of Figur'e 9, looking from the left,

Fi 'u're' 12'is a plan view of the detachable lug or connecting the stoker bar to its acse se. mes

Figure 13 is a perspective view of an alternate form of grate section, In the embodiment of the-invention shown in Figures 1 to 12 the improved stoker bar comprises a frame composed of a pair of end members 1. having'trunnions 2 adapted to fit recesses in bearing-bars for supporting the stoker bars, connected at one end by a curved shield 3, preferably formedintegrally with the endmembers'.

apertures which permit air to enter the fuel bed when the stoker bar isrocked, and which may receive bolts 4 for connecting to the curved shield of the stoker bar an arm 5 The shield is provided with a number of bymeans of which the bar is operatively con- 7 nected to actuating mechanism. This lug is provided with an upper portion 6 havingthe same curvature as the inner face of the shield, and provided with holes arranged to'register with holes in the shield at the point where it is desired that the lug'should be'attached. Those openings 27which receive the bolts 4 are preferably reamed at their outer ends,'t0 permit the heads of the bolts to lie flush with the outer face of the shield, and thus avoid any projectingmember upon said face, which would interfere with the operation of the apparatus. Each stoker bar is provided with a number of removable grate' sections each of which comprises a number of spaced longitudinal members 7 connected together at one end by transv'ers'e member 8 and near the other end by a second transverse member 9. Both of these transverse members project beyond the sides, of the bar a distance substantially equal to of the distance between the longitudinal members so that when the'several sections of the bar are in place, the spaces between the elements/Z of the sections will be of substantially the same width as the space between the longitudinal members of each section, thus providing a uniform grate surface throughout thewidth of the stoker'bar.

The ends of the longitudinal members are extended somewhat beyond the transverse member 9 and their'ends'are curved as indicated at 10.'thus forming a lower serrated they pass between the stoker bars during the cleaning operation. When the grate sections are inplace in the stoker bars the transverse portions 8 are adapted to rest upon the up per edge of the shield 3, and preferably the outer edges of these portions should be curved to correspond with the curvature of the shield. The weight of the grate sections may be depended upon for holding them in place upon the upper edge of the shield, but in order to provide additional means for this purpose, the longitudinal members 7 at the sides of each grate section may be eX- tended to provide lugs 11 adapted to enter slots 12 near the upper edge of the shield 3.

The grate sections 7 are supported at the opposite end from the shield 3 by a bar 15, which adapted to engage notches in the lower edges of the grate sections, at the opposite ends from the lugs 11. As shown in Figures 1 and 5, the side walls of the bar 15 are recessed longitudinally of the bar, and the notches of the grate sections 7 engage the bar. The notches maybe flaring notches, as shown at 16 in Figure 9, or they may he undercut notches as shown at 17 in lfiflfflr'i 7, to fit the inclined walls of the bar. ll hen the notches are undercut, as shown at 17 in Figure 7, the bar 15 must be disengaged from the notches, by sliding it longitudinally, that is transversely to the bar 7. This bar is connected to the end members 1, by means of lugs 18 at the ends of the bar, and spaced below the top thereof, so that the said lugs will not interfere with the engagement of the grate bar 7 with a bar 15,. The end members 1 are recessed as shown at 19, to receive the ends of the bar 15, and the lugs 18, and the said members have openings registering with openings in the lugs 18, to receive bolts 20 for connecting the bar 15 to the end members. Referring to Figure 1, it will be seen that there is sufficient space in the notch between the elements 8 and 11, for permitting expansion of the grate bars 7 .c The elements 8 protect the upper edge of the shield 3, which in the usual construction, quickly becomes burned out. Some space must be provided for expansion at the connection between the grate bars and the shiell for the opposite ends of the grate sections are fixed. The elements 8 not only protect the upper edge of the shield 3, but they prevent the dropping of fuel between the grate bars 7 and the shield. The elements 8 provide a continuous edge above the shield, and. an edge which may be replaced 7 when burnt out, thus lengthening the life of the stoker bar. To remove the grate sections, the bolts 20 are released, and the bars 15, togetherwith the grate sections moved away from the shield 3, until the lugs 11 are disengaged from the openings of the shield.

What I claim is l. A grate structure comprising a frame composed of curved shield, and end members, provided with trunnions on which the frame may rock, a plurality of detachable grate sections resting on the upper edge of the shield and cooperating to cover said edge and to form a guard for the same, and means for connecting said sections to the frame to prevent upward movement of said sections while permitting longitudinal expansion and contraction of the members.

2. A grate structure, comprising a frame composed of a curved shield and end members provided with trunnions on which the frame may rock, a plurality ,of'detachablc grate sections resting at one end on the upper edge of the shield and cooperating to cover said edge and to form a guard. for the same, said. sections and shield having; interengaging means for preventing upward movementof the sections and for permitting V longitudinal movement of. the sections a bar extending between the end members and detachably connected therewith, the grate sections having notches for receiving the bar. v i

3. A grate structure comprising a frame composed of a curved. shield and end men 1 here having trunnions, the shield being provided with apertures through which air may be supplied to the fuel bed, a plurality of detachable rate sections restin u on the upper edge of the shield and cooperating to cover the same and to form a guard therefor, means for securing the grate sections in place in the structure, and an arm for connecting the structure to an operating mecha nism, and fastening means for the arm passing through certain of said apertures.

4. A grate structure comprising a curved shield having end members provided with trunnions, the shield. being provided with slots near its upper edge. a plurality of grate resting one end upon the upper edge of the shield and cooperating to cover the same and to form a guard therefor, said sections being i u'ovidcd near the other end with re ceases having undercut side walls, a support ing bar between the end members shaped to fit the recesses in the grate sections, and means for detachablv securing the support inn; bar in place on the end members.

ture.

crease scram, iii-sta it a curved In testimony whereof I affix my Signet 

